EP1038674A1 - Dispositif de nettoyage à jet pour machines à imprimer - Google Patents

Dispositif de nettoyage à jet pour machines à imprimer Download PDF

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Publication number
EP1038674A1
EP1038674A1 EP99200551A EP99200551A EP1038674A1 EP 1038674 A1 EP1038674 A1 EP 1038674A1 EP 99200551 A EP99200551 A EP 99200551A EP 99200551 A EP99200551 A EP 99200551A EP 1038674 A1 EP1038674 A1 EP 1038674A1
Authority
EP
European Patent Office
Prior art keywords
blast
powder material
injector
cleaning
flow channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99200551A
Other languages
German (de)
English (en)
Inventor
Alfred M. Petersen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP99200551A priority Critical patent/EP1038674A1/fr
Publication of EP1038674A1 publication Critical patent/EP1038674A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/003—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods using material which dissolves or changes phase after the treatment, e.g. ice, CO2
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/18—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions
    • B24C3/20—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by turntables
    • B24C3/22—Apparatus using nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/04—Cleaning arrangements or devices for inking rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/26—Spraying devices

Definitions

  • the present invention relates to a cleaning apparatus for graphic equipment in the printing industry, in particular removing ink residues and the like from the surfaces of anilox rolls, inking rolls or the like, comprising blast cleaning means including an injector for continuous supplying a portion of blast powder material into a pressurised carrier airflow, said injector comprising an inlet with means for connecting the injector to a pneumatic air supply providing the pressurised airflow, a nozzle head for dispensing the blast powder material towards a surface of an item to be cleaned, and a flow channel connecting the inlet to the nozzle outlet, and into said flow channel blast powder material can be inserted into the pressurised air flow of the passage.
  • blast cleaning means including an injector for continuous supplying a portion of blast powder material into a pressurised carrier airflow, said injector comprising an inlet with means for connecting the injector to a pneumatic air supply providing the pressurised airflow, a nozzle head for dispensing the blast powder material towards a surface of an item to be cleaned, and a flow
  • Blast cleaning is efficient in cleaning surfaces, e.g. stripping a surface for paint.
  • the process is very cost effective and quick. Moreover no chemical solutions are needed making the process an environmentally friendly cleaning process.
  • This process is usual carried out as a sandblasting, using sand is the blast medium. However, the sandblasting is rough on the surface and leaving sand on or around the surface after it has been stripped of its top layer.
  • Sodium bicarbonate has an extremely fine grinding effect and is used in various polishing processes of surfaces. Moreover, the process is gentle and effective leaving no harmful substances since this blast medium is biodegradable.
  • blast cleaning with sodium bicarbonate has proven an outstanding alternative to the usual cleaning under use of chemical solutions and substances, in particular with respect to removing ink based on water solutions.
  • the blast cleaning process has proven both more cost efficient, quicker and considerably more environmentally friendly than the chemical cleaning processes since the blast medium dissolves in water and can be collected and lead directly into the public drainage system without polluting the environment. This avoids considerable costs of the disposal of the aggressive chemicals.
  • no special requirements for the storage facilities of the blast medium are needed.
  • the blast medium is inserted into a flow of pressurised air by using a differential pressure system, where a difference in pressure is created between the air flow of carrier air and in the storage container, placed just above the injector whereby the blast powder is supplied through an opening into the injector.
  • this known type of dosage system does only prove reliable when the pressurised air of the carrier air is above a certain level. Underneath a certain pressure level, the risk of pulsation is present due to an insufficient pressure in the supply tank.
  • the minimum required pressure constitutes a limitation, as the blast cleaning can be performed more gentle the less pressure of the air flow.
  • the sodium bicarbonate powder is particularly compressed at the outlet and thus might congest and even clog the outlet. The size of the outlet can be increased in order to reduce this problem, but by increasing the size of the outlet the concentration of blast powder material in the air stream is also increased.
  • the object of the invention is to provide an apparatus for blast cleaning of graphic equipment where the above-identified drawbacks are overcome and the injector is adjustable according to the type of job is to be done.
  • a cleaning apparatus of the initially mentioned kind wherein a sliding member having a air flow passage is provided in the flow channel creating at the downstream end of the sliding member a gap between a thereby created vacuum chamber into which blast powder material is to be fed from a preferably unpressurised blast powder material supply, said sliding member being shiftable in a first part of the flow channel whereby the size of the gap can be regulated according to a predetermined dosage of blast powder material into the air flow of through the injector.
  • a cleaning apparatus for the cleaning of graphic equipment where the proportionality between the concentration of blast powder material in the carrier air stream can be adjusted irrespective of the pressure of the pneumatic air supplied into the injector of the blast cleaning means.
  • blast pressure can be reduced offering a significantly more gentle or softer cleaning of the surface making the apparatus suitable for cleaning fragile surfaces of rolls in the printing industry, such as inking rolls, anilox rolls and the like, since the pressure can be significantly reduced by an apparatus according to the invention just as the concentration or dosage of blast powder material in the air stream can be adjusted according to the actual cleaning task.
  • the injector according to the invention is designed in such a way that air flow in the main flow channel of the injector creates at least a partial vacuum in the vacuum chamber whereby the blast powder material is sucked into the chamber from the supply line connected to the chamber. Due to the difference in pressure and the consequent direction of the air flow, the blast-powder particles flows into the main air stream and blasted onwards through the nozzle head and onto the surface to be cleaned.
  • the blast powder material is sodium bicarbonate. This is an extremely gentle polishing medium and ensures a smooth surface cleaning.
  • another blast powder media could alternatively be used in the event the conditions favours such other material.
  • the gap and the reception chamber being an annular chamber are concentrically arranged with the flow channel.
  • the gap and the reception chamber being an annular chamber are concentrically arranged with the flow channel.
  • fastening means are provided for maintaining the sliding member in a determined position in the flow channel, preferably an adjustment screw that tightens the sliding member in the housing of the injector.
  • the upstream end of the sliding member could further constitute the inlet of the flow channel.
  • the blast cleaning means further comprises a reduction valve, a shutter valve and preferably also a manometer inserted in the pneumatic air supply line to the injector.
  • the apparatus according to the invention can be connected to a pneumatic supply of a clean and dry air under a high pressure, e.g. up to 10 bar.
  • a high pressure e.g. up to 10 bar.
  • this pressure can be decreased to the desired blasting pressure level of e.g. 2-3 bar.
  • the blasting pressure can then be read on the manometer.
  • the apparatus is provided with water spraying means.
  • water spraying means By spraying water onto the surface prior to the blast impact with the sodium bicarbonate particles this softens the impact of the blast cleaning making the cleaning process even more gentle.
  • the water creates a protective film on the surface and prevent dust from occurring, just as the water has a rinsing effect by dissolving the sodium bicarbonate particles and removing the particles from the item to be cleaned.
  • the water spaying means does at least include a water spray nozzle on the injector for spraying directly onto the surface immediately prior to the impact of the blast powder material.
  • a sprinkling system could be arranged for rinsing a greater part or the whole of the roll or the like to be cleaned.
  • the blasting means are mounted on a traversing carriage being driven by traversing means in a traversing movement in a direction parallel with a graphic roller or the like to be cleaned.
  • the traversing of the blasting means ensures a uniform cleaning of the entire length of the roller or the like item to be cleaned.
  • the blast powder material is being fed to the injector through a flexible supply conduit. This facilitates feeding the injector with blast-powder particles during the traversing movement.
  • the roll, such as an anilox roll, to be cleaned is in the preferred embodiment placed in holding means in a vertical position, said holding means preferably also comprising driving means for rotating the accommodated roll.
  • the holding means is moreover preferably designed to accommodate rolls of different lengths, such as roll lengths of up to 650 mm or more, and the holding means, the blasting means and the water spraying means are arranged in a cabin, said means being commanded by process control means.
  • a compact apparatus is provided that is particular suitable for the printing industry as an efficient and environmentally friendly cleaning of e.g. anilox rolls can be carried out.
  • the cabin is preferably completely casing the holding means, water spray means and the blasting means and is provided with a transparent front door for inspection during the process and for rigging and de-rigging the apparatus.
  • a drain if feasible a vacuum exhaust drain.
  • the drain can be connected to a public drainage system via a settling tank, whereby harmful materials, i.e. ink residues are removed from the waste water. This means that environmentally harmful materials are not present in the waste water of the blast cleaning process according to the invention that is lead into the drainage system.
  • an injector 1 is supplied with pressurised air in a pneumatic air supply 2 through a reduction valve 3 reducing the air pressure to the blast pressure, a manometer 4 and a shutter valve 5.
  • the pneumatic air supply can provide air with as much as 10 bar that then can be reduced with as much as 7-8 bar creating a wanted blasting pressure of as less as 2-3 bar.
  • the air flow is entered into the injector 1 by the inlet 6.
  • the air flow passes through a flow channel 7 in the injector 1 to the outlet 8 which is formed as a flat nozzle 8.
  • Sodium bicarbonate blast powder material is sucked from a container 9 through a supply conduit 10 into the flow channel 7 of the injector 1.
  • the blasting means is arranged for traversing movement such as indicated by the arrow 11 in fig. 1 and 3.
  • the path of the traversing movement is parallel to the longitudinal axis of the anilox roll 12 mounted in the holding means 13 of the apparatus.
  • the holding means 13 include driving means 14 for rotating the roll 12 inserted in the apparatus for being blast cleaned.
  • the distance from the outlet nozzle 8 and the surface of the roller 12 is adjustable.
  • a water spray nozzle 16 is mounted on the injector 1 in such a position that the surface immediately before the line of blast cleaning - seen in the direction of the rotation 15 of the roll 12 - is sprayed with water smoothing the impact of the blast cleaning powder on the surface.
  • the water spray nozzle 16 is connected to a water supply tube 17, such as e.g. a normal 1 ⁇ 2" tube.
  • a water sprinkler 18 can be arranged inside the top and/or the side of the cabin 19 in which the blasting means and the holding means are arranged.
  • the amount of water used is app. 1.5 litres/min.
  • the amount used is app. 2.5 litres/min.
  • the traversing movement 11 of the blasting means and the rotation 15 of the roll 12 is controlled by the controlling means 20.
  • the whole control system can be connected to a normal power supply, such as a 220 V AD supply or the like.
  • the injector 1 is view in more detail in figure 2 that is a cross-sectional view of the injector housing 21 having an inlet 6 and an outlet 8 communicating through a flow channel 7.
  • a sliding member 22 is disposed in an axially shiftable arrangement.
  • the sliding member 22 is retained in a certain axial position in relation to the flow channel 7 by fastening means 23, such as a screw.
  • the first part 7a of the flow channel 7 is cylindrical in shape and has a bigger diameter than the rest of the flow channel 7.
  • the sliding member 22 is shaped with a main body having a diameter tightly fitting into the first part 7a of the flow channel 7 and with a tubular extension in such a way that an internal chamber 24 is created between the sliding member 22 and the narrowing 25 of the flow channel 7.
  • the sliding member 22 is provided with a flow passage 7b through the main body and the tubular extension that preferably is concentric with the flow channel 7 and 7a.
  • a gap 26 is created between the relatively steep degrease in diameter of the flow channel 7, the so-called narrowing 25, and the downstream end of the tubular extension of the sliding member 22.
  • the size of the gap 26 can be changed whereby the amount of blast-powder sucked into the flow channel 7 by the flow of pressurised air can be regulated.
  • a graphic roller 12 is placed in the holding means 13.
  • the upper gripping part of the holding means 13 is mounted on a rail so that rolls of different sizes can be accommodated between the two gripping parts of the holding means 13.
  • the apparatus is designed to accommodate rolls of up to 650 mm in length including roll axles.
  • the roll 12 can be continuously rotated in the holding means by the driving means 14.
  • the blasting means can traverse up and down along the roll 12.
  • the blasting means comprise an injector 1 having a nozzle head 8 directed towards the surface of the roll 12. The distance can be adjusted according to the setting of the actual cleaning job.
  • a water spray 16 is arranged on the injector 1 .
  • the blasting is turned on and the nozzle head 8 is traversed in a number of strokes, normally 1 to 5 strokes, depending on the need for cleaning.
  • the relation between the traverse velocity and the angular velocity of the roller 12 is controlled by the control means in such a way that the cleaning is carried out in helical strips with an overlap on the roller surface.
  • the overlap is preferably equal to half the width of the flat nozzle head so that all points on the surface has been encountered two times per stroke.
  • the velocities involved are relative small, preferably in the order of app. 2-6 revolutions per minute.
  • water is sprayed onto the surface of the roll 12.
  • a water sprinkler 18 is arranged for rinsing the roll 12 by spraying water into the cabin and onto the roll.
  • the water sprinkling can be increased after the blast-cleaning as a finishing rinsing of the roll dissolving and removing excess powder.
  • a drain (not shown) is provided leading the water and the dissolved sodium bicarbonate powder into the public drainage system.
  • a pneumatic air supply and a blast-powder supply 9 are arranged on the side of the cabin 19 .
  • the capacity of the supply 9 is in a concrete embodiment 6 litres (app. 5 kilos) of sodium bicarbonate powder.
  • the use of blast-powder during normal operation is app. 200 g/min.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP99200551A 1999-02-26 1999-02-26 Dispositif de nettoyage à jet pour machines à imprimer Withdrawn EP1038674A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99200551A EP1038674A1 (fr) 1999-02-26 1999-02-26 Dispositif de nettoyage à jet pour machines à imprimer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99200551A EP1038674A1 (fr) 1999-02-26 1999-02-26 Dispositif de nettoyage à jet pour machines à imprimer

Publications (1)

Publication Number Publication Date
EP1038674A1 true EP1038674A1 (fr) 2000-09-27

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EP99200551A Withdrawn EP1038674A1 (fr) 1999-02-26 1999-02-26 Dispositif de nettoyage à jet pour machines à imprimer

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EP (1) EP1038674A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006102867A1 (fr) * 2005-03-30 2006-10-05 Oezhan Selim Procede pour nettoyer la surface de rouleaux a entrainement rotatif
USRE43824E1 (en) 2001-01-11 2012-11-20 Powder Pharmaceuticals Inc. Needleless syringe
US8540665B2 (en) 2007-05-04 2013-09-24 Powder Pharmaceuticals Inc. Particle cassettes and processes therefor
CN109821801A (zh) * 2019-03-20 2019-05-31 无锡卓海科技有限公司 一种电子束扫描测量仪离子泵的延寿装置及其使用方法
CN114786872A (zh) * 2019-12-12 2022-07-22 日本制铁株式会社 辊表面的异物去除装置、辊表面的异物去除方法及钢带的制造方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2026590A1 (de) * 1969-06-11 1970-12-17 Buser Ag Maschf Fritz Vorrichtung zum Reinigen von Hohlzylindern
US4389820A (en) * 1980-12-29 1983-06-28 Lockheed Corporation Blasting machine utilizing sublimable particles
WO1986000833A1 (fr) * 1984-07-31 1986-02-13 Cryoblast Inc. Procede et appareil de nettoyage
EP0180541A1 (fr) * 1984-10-31 1986-05-07 H. Schneebeli & Co.AG Procédé et dispositif de nettoyage d'une forme d'impression
EP0359000A1 (fr) * 1988-08-29 1990-03-21 Fukashi Urakami Dispositif de nettoyage
WO1991012137A1 (fr) * 1990-02-13 1991-08-22 Baldwin Technology Corporation Nettoyage au dioxyde de carbone d'equipement d'arts graphiques
EP0747217A2 (fr) * 1995-06-06 1996-12-11 MAN Roland Druckmaschinen AG Procédé et dispositif pour nettoyer un cylindre d'une machine à imprimer rotative
US5616067A (en) * 1996-01-16 1997-04-01 Ford Motor Company CO2 nozzle and method for cleaning pressure-sensitive surfaces

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2026590A1 (de) * 1969-06-11 1970-12-17 Buser Ag Maschf Fritz Vorrichtung zum Reinigen von Hohlzylindern
US4389820A (en) * 1980-12-29 1983-06-28 Lockheed Corporation Blasting machine utilizing sublimable particles
WO1986000833A1 (fr) * 1984-07-31 1986-02-13 Cryoblast Inc. Procede et appareil de nettoyage
EP0180541A1 (fr) * 1984-10-31 1986-05-07 H. Schneebeli & Co.AG Procédé et dispositif de nettoyage d'une forme d'impression
EP0359000A1 (fr) * 1988-08-29 1990-03-21 Fukashi Urakami Dispositif de nettoyage
WO1991012137A1 (fr) * 1990-02-13 1991-08-22 Baldwin Technology Corporation Nettoyage au dioxyde de carbone d'equipement d'arts graphiques
EP0747217A2 (fr) * 1995-06-06 1996-12-11 MAN Roland Druckmaschinen AG Procédé et dispositif pour nettoyer un cylindre d'une machine à imprimer rotative
US5616067A (en) * 1996-01-16 1997-04-01 Ford Motor Company CO2 nozzle and method for cleaning pressure-sensitive surfaces

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE43824E1 (en) 2001-01-11 2012-11-20 Powder Pharmaceuticals Inc. Needleless syringe
WO2006102867A1 (fr) * 2005-03-30 2006-10-05 Oezhan Selim Procede pour nettoyer la surface de rouleaux a entrainement rotatif
US8540665B2 (en) 2007-05-04 2013-09-24 Powder Pharmaceuticals Inc. Particle cassettes and processes therefor
US9044546B2 (en) 2007-05-04 2015-06-02 Powder Pharmaceuticals Incorporated Particle cassettes and processes therefor
US9358338B2 (en) 2007-05-04 2016-06-07 Powder Pharmaceuticals Incorporated Particle cassettes and processes therefor
CN109821801A (zh) * 2019-03-20 2019-05-31 无锡卓海科技有限公司 一种电子束扫描测量仪离子泵的延寿装置及其使用方法
CN109821801B (zh) * 2019-03-20 2023-11-17 无锡卓海科技股份有限公司 一种电子束扫描测量仪离子泵的延寿装置及其使用方法
CN114786872A (zh) * 2019-12-12 2022-07-22 日本制铁株式会社 辊表面的异物去除装置、辊表面的异物去除方法及钢带的制造方法

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